Originally Posted By: Lifeguard
I was giving the observations about powerglides, 3.08 gears, 3.55 gears, and the TH350. So i looked at it from a different angle, comparing the combined first gear ratio based on Preacher-No Choir's observations:

Powerglide 1.82 & 3.08 rear: 5.61:1 combined ratio
Powerglide 1.82 & 3.55 rear: 6.46:1 combined ratio
TH350 2.52 & 3.08 rear: 7.76:1 combined ratio

Preacher said replacing a 3.08 with a 3.55 was almost like going to a TH350. The TH350 with 3.08 is definitely a deeper first gear than even the Powerglide with the 3.55. The math seems to indicate that the TH350 is better than the Pglide/3.55 even with the "kiss of death" 3.08. Not sure how that helps with picking a deeper gear tho?

I'm not sure what axle the Nova has, the L6 post 1970 Camaros all came with a GM Corporate 10 bolt rear and only 2.56, 2.73, 3.08, 3.42, and 3.73 from the factory. No 3.55 like the early SD 10 bolts had.


One thing to remember about the PowerGlide is that it takes approximately 19 fewer horsepower to run it as opposed to the turbo and other transmissions. Years ago, we swapped out a turbo 400 for a PG and picked up .200 second with NO other changes. We even used the same torque converter by installing a turbo input shaft in the PG!!

The Glide isn't as streetable in a heavier car, but in a small, light vehicle and set up right, it presents some interesting possibilities!!


Never use a minor caliber bullet on a major caliber adversary